Well, after almost 2 months of parading ads on our blog, the AdSense team (the portion of Google that provides the ad service) has determined that the "clicks" on our ads were invalid. I don't know what that means, and they don't explain. We feel used (and not in a good way).
However, after "earning" $50 over the two months, which they didn't pay, we were very disappointed. I actually got into the habit of checking the account each day and being excited to learn that we had earned 70 cents or so. But that ended when, out of the blue, they cancelled our account with no warning. Suffice it to say that we have removed the ads and have joined the numerous people who are disenfranchised with Google AdSense. After canceling our account, they would have left the ads on, so I had to remove them, myself. You can read some other complaints here and also here.
So for all you purists out there that felt we were "selling out" by allowing crass materialistic ads to appear on our pristine blog, you should be very happy. We have learned our lesson and would not try and use an ad program, especially AdSense, again. Except for the powerful name backing them, it would seem to be a scam.
Twenty-five dollars a month would not appear to be a large amount, but we could have enjoyed a dinner at our local restaurant. So I will have to content ourselves with an ad-free blog and homemade tacos.